\begin{tikzpicture}[>=Stealth, scale=2]
    \draw [->] (-1.3,0) -- (1.7,0) node[anchor=north] {$x$};
    \draw [->] (0,-1.3) -- (0,1.3) node[anchor=east] {$y$};
    \node at (-0.15,-0.15) {$O$};
    \draw [name path=c] (0, 0) circle(1.0);

    \draw [name path=a1] (0,0) -- (140:1.3) node[anchor=south] {$\alpha$的终边};
    \draw [name intersections={of=a1 and c, by=A}]
       let \p1=(A)
       in (A) +(-0.05, -0.05) node[anchor=east] {$P$}
          (\x1,\y1) -- (\x1, 0) node [anchor=north] {$M$};

    \path [name path=a2] (1,0) -- (1, -1);
    \path [name path=a3] (0,0) -- (320:1.5);
    \path [name intersections={of=a2 and a3}];
    \coordinate(T) at (intersection-1);
    \draw [dashed] (0, 0) -- (T) node[anchor=north] {$T$};
    \draw (T) -- (1, 0)  +(0.3, 0.15) node {$A(1,0)$};
\end{tikzpicture}
